7.5 HighCWE-362
CVE-2026-5947
ISC BIND 9 vulnerability
ISCBIND 9
Status
- Not in CISA KEV
- Vendor fix available
Exploit probabilityEPSSchecked 24 Oct
0.8%probability of exploitation in the next 30 days
Higher than 56% of scored CVEs
SeverityCVSS
7.5High
Description NVD
Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.
Coverage 1 article · 1 outlet
- BIND 9 flaws let attackers crash DNS and drain bandwidthSecurityOnline · first in our coverage · mentions it in passing